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Calcium oxide doped sorbents for CO2 uptake in the presence of SO2 at high temperatures / Hong Lu in Industrial & engineering chemistry research, Vol. 48 N° 11 (Juin 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 11 (Juin 2009) . - pp. 5454–5459 Titre : Calcium oxide doped sorbents for CO2 uptake in the presence of SO2 at high temperatures Type de document : texte imprimé Auteurs : Hong Lu, Auteur ; Panagiotis G. Smirniotis, Auteur Année de publication : 2009 Article en page(s) : pp. 5454–5459 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Carbon  dioxide  Sorbent  tolerance  Sulfur  dioxide  Calcium  oxide  sorbent  Dopants Résumé : There is an urgent need to understand sorbent tolerance for capturing carbon dioxide (CO2) in the presence of sulfur dioxide (SO2). Sulfur oxide is emitted together with CO2 from various combustion systems and can cause severe air pollution. In this study, the behavior of different dopants on the performance of calcium oxide (CaO) sorbent for capturing CO2 in the presence of SO2 was investigated. Three main sets of experiments were carried out to study carbonation and sulfation both separately and simultaneously using a thermogravimetric analyzer (TGA). The results show that SO2 reduced the capability of the sorbents for capturing CO2 because of the competition between carbonation and sulfation reactions. Formation of calcium carbonate (CaCO3) and calcium sulfate (CaSO4) took place upon carbonation and sulfation, respectively. Our TGA and X-ray photoelectron spectroscopy (XPS) results indicate that the carbonation is totally reversible, while this is not the case with the sulfation. The permanent residual weight gained by the sorbents during the course of sulfation is attributed to the irreversible formation of sulfate species, which is confirmed by both the TGA and XPS results. The Ce promoted CaO sorbent exhibits the best performance for CO2 capture and is the most SO2 tolerant sorbent. On the other hand, the Mn doped dopant has the strongest affinity for SO2. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900162k [article] Calcium oxide doped sorbents for CO2 uptake in the presence of SO2 at high temperatures [texte imprimé] / Hong Lu, Auteur ; Panagiotis G. Smirniotis, Auteur . - 2009 . - pp. 5454–5459. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 11 (Juin 2009) . - pp. 5454–5459 Mots-clés : Carbon  dioxide  Sorbent  tolerance  Sulfur  dioxide  Calcium  oxide  sorbent  Dopants Résumé : There is an urgent need to understand sorbent tolerance for capturing carbon dioxide (CO2) in the presence of sulfur dioxide (SO2). Sulfur oxide is emitted together with CO2 from various combustion systems and can cause severe air pollution. In this study, the behavior of different dopants on the performance of calcium oxide (CaO) sorbent for capturing CO2 in the presence of SO2 was investigated. Three main sets of experiments were carried out to study carbonation and sulfation both separately and simultaneously using a thermogravimetric analyzer (TGA). The results show that SO2 reduced the capability of the sorbents for capturing CO2 because of the competition between carbonation and sulfation reactions. Formation of calcium carbonate (CaCO3) and calcium sulfate (CaSO4) took place upon carbonation and sulfation, respectively. Our TGA and X-ray photoelectron spectroscopy (XPS) results indicate that the carbonation is totally reversible, while this is not the case with the sulfation. The permanent residual weight gained by the sorbents during the course of sulfation is attributed to the irreversible formation of sulfate species, which is confirmed by both the TGA and XPS results. The Ce promoted CaO sorbent exhibits the best performance for CO2 capture and is the most SO2 tolerant sorbent. On the other hand, the Mn doped dopant has the strongest affinity for SO2. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900162k